INSTRUMENTAL SUPPORT AND RESULTS OF LONGITUDINAL AND TRANSVERSE ELASTIC WAVES VELOCITY MEASURE IN COAL SAMPLES UNDER UNIAXIAL LOADING

The description of the structural schemes and principles of laboratory setup for the automatic and simultaneous measurement of the velocity of propagation of longitudinal and transverse VS, VP elastic waves in the same sample of fossil coal under uniaxial mechanical loading is given. Laboratory setup implements ultrasonic transit-time measurement method, providing the required accuracy of the location of the first half-wave transverse wave with use of information of VP measured value as well as a priori information about a possible relationship between VP and VS. Results are obtained experimentally on the Kuznetsk Basin coal samples. Relationships VP and VS as a function of operating voltages are found. VP / VS ratio and dynamic modulus of elasticity are calculated. The analysis of these dependencies with respect to their sensitivity to the stages of deformation.

This study has been supported by the Russian Science Foundation, Project No. 161700029.

Keywords

Samples, coal, ultrasonic, transverse wave, stress state, speed.

Issue number: 11
Year: 2016
ISBN:
UDK: 622.02: 539.2
DOI:
Authors: Shkuratnik V. L., Nikolenko P. V., Mitrofanov E. R.

About authors: Shkuratnik V.L., Doctor of Technical Sciences, Professor, Chief Researcher, e-mail: v.shkuratnik@misis.ru, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia, Nikolenko P.V., Candidate of Technical Sciences, Researcher, e-mail: ftkp@mail.ru, Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia, Mitrofanov E.R., Graduate Student, e-mail: ftkp@mail.ru, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

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